The Florida Department of Law Enforcement has confirmed that there have been at least seven cases, including Charles Walker and Joseph Jenkins, where inmates forged documents for early release, NBC News reported.

Fifty years ago this week, three men were able to break out of the world's most secure prison: Alcatraz. Click through this slideshow to see how the inmates made their escape. One question remains: What happened to them after they got out?

FDLE spokeswoman Gretl Plessinger told NBC News that five of the seven cases of phony documents came from Franklin Correctional Institution.

FDLE has not ruled out that the mistaken releases were an inside job, according to WPBF's sister station in Orlando, WESH 2 News.

Plessinger said the forged documents were mailed to the Clerk of the Courts Office.

"We have pinpointed more suspects," Plessinger said. "Arrests are imminent."

FDLE said Jenkins and Walker are not cooperating with investigators.

FDLE says escapees were awaiting transportation when caught

Days after the convicted killers were captured in Panama City Beach, FDLE is trying to figure out the details behind their escape.

Jenkins and Walker, both 34, are accused of using forged court documents from Orange County to get out of prison. They were both serving life sentences when the fraudulent paperwork was filed on their behalf, authorizing their release.

Walker was convicted in the 1999 shooting death of 23-year-old Cedric Slater, and Jenkins was convicted in a 1998 killing of Roscoe Pugh, both in Orange County.

The duo had been on the run for weeks until officials were tipped off by one of the escapees' friends on their location.

FDLE agents said they have reason to believe both men were ready to cross the state border.

"At the time we apprehended these fugitives, they were awaiting transportation from Atlanta to another state," FDLE Commissioner Gerald Bailey said.

Now, officials are turning their full attention to those who may have helped the duo get away. The FDLE is examining the fraudulent court papers for traces of DNA.

They're also looking into a tip that they may have paid someone $8,000 to construct the phony court motions and orders.

Legal analyst Richard Hornsby said it may be difficult to prove the men committed a criminal act related to their release.

"Unless they confess to their role in the forgeries, it will be difficult to prosecute them because you have to prove that they took part and they actually conspired in creating the forgeries," said Hornsby.

Hornsby said the two could be offered better living conditions if they tell authorities what they know about the scam.

Florida Department of Corrections is changing its inmate release policy to require prison officials to verify with judges before releasing prisoners early.